There is nothing worse then getting a pup from 6 weeks old putting all your time and effort and at 16,18 months the dogs does not want to know.Would not wish it on any one.Be it off the best of breeding or a pup you have been given for free.
So many factors play apart in a dog jacking but most time its all about the heart.Some dogs just don't have it in them to do there job there breed for.